Which of the following surrounds some (or many) axons, providing insulation that increases conduction speed?
Ans: A myelin sheath
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Which of the following statements regarding PTH (parathyroid hormone) is true?
A. PTH causes increased Na+ reabsorption in the kidneys. B. PTH causes increased reabsorption of Ca2+ in the kidneys. C. PTH causes increased loss of Ca2+ from the kidneys. D. PTH causes decreased uptake of Ca2+ from the small intestine. E. PTH causes decreased vitamin D formation in the kidneys.
One horsepower equals ________________ watts of electricity
Fill in the blank(s) with correct word
Where does fertilization usually occur?
A) uterus B) vagina C) ampulla of the uterine tube D) infundibulum of the uterine tube
What process in meiosis involves random alignment of chromosomes?
A. Crossing over B. Mitosis C. Independent assortment D. Meiosis II